The current issue of Countryside has an article on cutting ice off of a pond for storage in an icehouse. Some years ago I visited with someone in CO. They were in the process of building an ice room under their front porch. Plans were to just freeze tap water in 5-gallon plastic buckets outside. When frozen solid they would be brought into a heated area and put upside down until the ice chunk came out of the bucket. The chunk would then be stacked in the ice room. They thought they could have ice until at least mid-summer this way.